package com.like.miaosha.redis;

import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

import java.awt.*;

@Service
public class RedisService {
    @Autowired
    JedisPool jedisPool;

    public <T> T get(KeyPrefix keyPrefix,String key,Class<T> clazz){
        Jedis jedis=null;
        try {
            jedis=jedisPool.getResource();
            String realKey=keyPrefix.getPrefix()+ key;
            String str=jedis.get(realKey);
            T t=stringToBean(str,clazz);

            return t;
        }finally {
            returnToPool(jedis);
        }
    }
    public <T> boolean set(KeyPrefix keyPrefix, String key, T value){
        Jedis jedis=null;
        try {
            jedis=jedisPool.getResource();
            String realKey=keyPrefix.getPrefix()+ key;
            String str=beanToString(value);
            if(str==null||str.length()==0)
                return false;
            int expireSeconds = keyPrefix.expireSeconds();
            if(expireSeconds<=0){
                jedis.set(realKey,str);
            }
            else {
                jedis.setex(realKey,expireSeconds,str);
            }
            return true;
        }finally {
            returnToPool(jedis);
        }
    }

    public <T> Long incr(KeyPrefix keyPrefix,String key){
        Jedis jedis=null;
        try {
            jedis=jedisPool.getResource();
            String realKey=keyPrefix.getPrefix()+ key;
            return jedis.incr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    public <T> Long decr(KeyPrefix keyPrefix,String key){
        Jedis jedis=null;
        try {
            jedis=jedisPool.getResource();
            String realKey=keyPrefix.getPrefix()+ key;
            return jedis.decr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    public static <T> T stringToBean(String str,Class<T> clazz) {
        if(str ==null||str.length()==0)
            return null;
        if(clazz==int.class||clazz==Integer.class) return (T) Integer.valueOf(str);
        else if(clazz==long.class||clazz==Long.class) return (T) Long.valueOf(str);
        else if(clazz==String.class) return (T) str;
        else return JSON.toJavaObject(JSON.parseObject(str),clazz);
    }
    public static <T> String beanToString(T value) {
        if(value==null){
            return null;
        }
        Class<?> clazz=value.getClass();
        if(clazz==int.class||clazz==Integer.class){
            return ""+value;
        }
        else if(clazz==long.class||clazz==Long.class){
            return ""+value;
        }
        else if(clazz==String.class){
            return (String)value;
        }
        else{
            return JSON.toJSONString(value);
        }
    }

    /**
     * 判断key是否存在
     * */
    public <T> boolean exists(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.exists(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    public boolean delete(KeyPrefix keyPrefix,String key){
        Jedis jedis=null;
        try {
            jedis=jedisPool.getResource();
            //真正的key
            String realKey=keyPrefix.getPrefix()+ key;
            long ret=jedis.del(key);
            return ret>0;
        }finally {
            returnToPool(jedis);
        }
    }

    private void returnToPool(Jedis jedis) {
        if(jedis!=null)
            jedis.close();
    }


}
